What is the exponential regression equation that fits these data

The long jump record, in feet, at a particular school can be modeled by f(x) = 19.6 + 2.5ln(x + 1) where x is the number of years since records began to be kept at the school. what is the record for the long jump 11 years after record started being kept? round your answer to the nearest tenth.

Which value is not a solution of 8x^3 – 1 = 0

Math it's appreciated. (picture provided)